Irish lichens

Order: Verrucariales       Family: Verrucariaceae

Verrucaria prominula

Growth type crustose
Photos: On coastal rock above HWM. Allihies, Co. Cork, SW Ireland.

Thin, sometimes slightly waxy, greyish to pale mauve-brown thallus. Perithecia are usually prominent, the apex +/- rounded or flattened, 0.3-0.5(-0.8) mm diam. Spores simple, oblong with rounded apices, (10.5-)11.5-14(-16) x (4.5-)6.5-8(-9) Ám. Micro photo below.
Chemical reactions negative.

Coastal distribution in dry crevices or on shady, vertical faces of siliceous rocks above the splash zone. Most frequently recorded in Ireland from western Atlantic coasts.

Microscope photograph

Verrucaria prominula. March 2012

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